the bearings
Sometimes when parts are new, they have coatings and etc. that will smell when parts are warm. For example, alternator windings are coated with a electrical varnish. When the alternator is charging, it creates heat. This causes the paint to smell and odors such as a burning smell can be common for a couple of days.
If your talking about cars... If you smell a burning smell, or your red battery light comes on then i would get your alternator checked out!
Electrical fire or bad bearings. The alternator is probably toast. Buy a new one.
This would depend on your nose. A bad CMP sensor may cause improper burning of the fuel and can give a smell out the tailpipe. Will the CMP smell? Never. A Ford camshaft syncronizer will squeek and could cause a metallic burning smell.
Several thing scan cause a burning smell from a car A/C. One cause can be that the compressor is burning up. Another possibility is a wiring shortage.
it will smell and cause co2 there happy
humming birds can't smell
The smell was dead bodies being burned to ashes
There are generally two signs that the alternator is going bad. First is the noise. A new noise will begin to be heard. Something like a whining when the car is accelerating. Second is the smell. You may smell burning from the engine department.
It's possible that your alternator is overcharging your battery.
Your car may be on fire.
A rubber burning smell and smoke near your two front tires could be the result of sticking calipers. The brake line could also be the cause of the burning smell.